MEDICINE
RADIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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D-speed
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F-speed
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A-speed
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H-speed
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Detailed explanation-1: -The film typically used for the intraoral bitewing exam falls into three film speed classes-D (slowest), E and F-speed (fastest). Like photographic film, the faster the film, the less exposure it needs.
Detailed explanation-2: -Use of F-speed film reduces exposure 25% compared to E and 60% compared to D-speed film. The FDA recommends that film below E-speed not be used for dental radiography because it contributes to greater than necessary patient exposure.
Detailed explanation-3: -HIGHER FILM SPEEDS: Using the fastest film available significantly reduces radiation exposure. Currently, intraoral X-ray film is available at three speeds: D, E, and F. E-speed film is almost twice as fast as D-speed film-and about 50 times faster than traditional x-ray film.
Detailed explanation-4: -A setting of 70 to 90 kVp on the control panel of the dental x-ray machine helps minimize patient exposure.
Detailed explanation-5: -Intensifying screens are composed of light-emitting phosphors that fluoresce when exposed to x-rays. Because radiographic film is sensitive to light, fewer x-rays are needed to expose the film. This allows the exposure technique to be reduced, which reduces patient exposure to x-radiation.